| abstract |
Compounds of formula (I) are disclosed. n n n n n n n n n n The tetrapyrole ring in formula (I) can be substituted with a metal cation (M); R 1 , R 2 , R 3 and R 4 separately represent a hydrogen atom, a C1-4 alkyl or alkyloxy radical, or a phenyl radical optionally substituted by vinyl, hydroxy, nitro, amino, bromo, chloro, fluoro, iodo, benzyloxy, or hydroxymethyl radicals; R 5 , R 6 , R 7 and R 8 separately represent a hydrogen atom or a C1-4 alkyl radical; R a , R b and R c separately represent a hydrogen atom, a C1-4 alkyl or alkyloxy radical optionally substituted by a halogen, or a phenyl radical optionally substituted by vinyl, hydroxy, nitro, amino, bromo, chloro, fluoro, iodo, benzyloxy, or hydroxymethyl radicals, wherein at least one of R a , R b , and R c is a phenyl radical. Compounds of formula (I) bound to a silica, a sol-gel material or a mesoporous silica are useful for selective trapping of carbon monoxide. |